
/* @(#)w_sqrt.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
FUNCTION
    <<sqrt>>, <<sqrtf>>---positive square root

INDEX
    sqrt
INDEX
    sqrtf

ANSI_SYNOPSIS
    #include <math.h>
    double sqrt(double <[x]>);
    float  sqrtf(float <[x]>);

TRAD_SYNOPSIS
    #include <math.h>
    double sqrt(<[x]>);
    float  sqrtf(<[x]>);

DESCRIPTION
    <<sqrt>> computes the positive square root of the argument.
    You can modify error handling for this function with
    <<matherr>>.

RETURNS
    On success, the square root is returned. If <[x]> is real and
    positive, then the result is positive.  If <[x]> is real and
    negative, the global value <<errno>> is set to <<EDOM>> (domain error).


PORTABILITY
    <<sqrt>> is ANSI C.  <<sqrtf>> is an extension.
*/

/*
 * wrapper sqrt(x)
 */

#include "fdlibm.h"
#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double sqrt(double x)       /* wrapper sqrt */
#else
    double sqrt(x)          /* wrapper sqrt */
    double x;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_sqrt(x);
#else
    struct exception exc;
    double z;
    z = __ieee754_sqrt(x);
    if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
    if(x<0.0) {
      exc.type = DOMAIN;
      exc.name = "sqrt";
      exc.err = 0;
      exc.arg1 = exc.arg2 = x;
      if (_LIB_VERSION == _SVID_)
        exc.retval = 0.0;
          else
            exc.retval = 0.0/0.0;
          if (_LIB_VERSION == _POSIX_)
            Djy_SaveLastError(EDOM);
          else if (!matherr(&exc)) {
            Djy_SaveLastError(EDOM);
          }
          if (exc.err != 0)
        Djy_SaveLastError(exc.err);
      return exc.retval;
    } else
        return z;
#endif
}

#endif /* defined(_DOUBLE_IS_32BITS) */
